Data section exceeds available space in board

Development Boards Arduino
1

I’m making a small game recently and I want to use Arduino to do it. My code compiles without problems, but when I upload it, I get an error like the one shown in the picture, is it because I have too many variables defined?

Can someone please tell me how to fix it?

Arduino:1.8.12 (Windows 10), Development board: "Arduino Uno"

The project uses 6336 bytes, which occupies (19%) of the program storage space. The maximum is 32256 bytes. data section exceeds available space in board

Global variables used 3046 bytes, (148%) of dynamic memory, leaving -998 bytes for local variables. The maximum is 2048 bytes.
There is not enough memory; visit the following URL to follow the instructions to reduce memory usage.
http://www.arduino.cc/en/Guide/Troubleshooting#size
Error while compiling for development board Arduino Uno.

Turn on in File -> Preferences
"Show detailed output during compilation" option
This report will contain more information.
2

It is not so much the number of variables, but the amount of space they are using. Also string literals are typically in the same memory region. But they and some other items could possibly be moved into [program memory. If you have a lot of debugging messages, you may want to try something like https://gitlab.com/-/snippets/2116319

If you care to post the code someplace, we can see what you are doing and give more specific suggestions.](PROGMEM - Arduino Reference)

3 
unsigned int r_flag1 = 0;
uint8_t   RecievedTemp1[30]       = {0};

uint8_t   cout_i = 0;
unsigned int quan_hang1 = 0;
unsigned int quan_hang2 = 0;
unsigned int quan_hang3 = 0;
unsigned int quan_lie1 = 0;
unsigned int quan_lie2 = 0;
unsigned int quan_lie3 = 0;
unsigned int quan_zuoxia = 0;
unsigned int quan_youxia = 0;


unsigned int cha_hang1 = 0;
unsigned int cha_hang2 = 0;
unsigned int cha_hang3 = 0;
unsigned int cha_lie1 = 0;
unsigned int cha_lie2 = 0;
unsigned int cha_lie3 = 0;
unsigned int cha_zuoxia = 0;
unsigned int cha_youxia = 0;
unsigned int cha[8]={0};
void setup()
{
   Serial.begin(115200);
   for(int i=3; i<=8; i++) 
   pinMode(i,OUTPUT);
}

void loop(){

  if(Serial.available() != 0)
  {
//    for(cout_i = 0; cout_i < 30; cout_i ++)
//    {
//        //RecievedTemp1[cout_i] = Serial.readBytes(RecievedTemp1, 15);
//        Serial.readBytes(RecievedTemp1, 20);
//        //Serial.println(RecievedTemp1[cout_i]);
//    }
    Serial.readBytes(RecievedTemp1, 20);
//    for(cout_i = 0; cout_i < 19; cout_i ++)
//    {
//    Serial.println(RecievedTemp1[cout_i]);
//    }
    switch(RecievedTemp1[13])
  {
  case 49:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image2\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang1++;
        quan_lie1++;
        quan_youxia++;
//        quan[0]++;
//        quan[3]++;
//        quan[7]++;
        Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button1\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image2\",\"image\":\"x\"}>ET");
         r_flag1 = 0;
            cha_hang1++;
            cha_lie1++;
            cha_youxia++;
//        cha[0]++;
//        cha[3]++;
//        cha[7]++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button1\",\"enable\":false}>ET");
        }
        
        break;
  case 50:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image3\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang1++;
            quan_lie2++;
//        quan[0]++;
//        quan[4]++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button2\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image3\",\"image\":\"x\"}>ET");
         r_flag1 = 0;
         cha_hang1++;
           cha_lie2++;
//        cha[0]++;
//        cha[4]++;
           Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button2\",\"enable\":false}>ET");
        }
        break;
  case 51:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image4\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang1++;
            quan_lie3++;
            quan_zuoxia++;
//        quan[0]++;
//        quan[5]++;
//        quan[6]++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button3\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image4\",\"image\":\"x\"}>ET");
         r_flag1 = 0;
         cha_hang1++;
           cha_lie3++;
            cha_zuoxia++;
//        cha[0]++;
//        cha[5]++;
//        cha[6]++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button3\",\"enable\":false}>ET");
        }
        break;
  case 52:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image5\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang2++;
            quan_lie1++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button4\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image5\",\"image\":\"x\"}>ET");
         r_flag1 = 0;
         cha_hang2++;
           cha_lie1++;
           Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button4\",\"enable\":false}>ET");
        }
        break;
  case 53:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image6\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang2++;
            quan_lie2++;
            quan_zuoxia++;
            quan_youxia++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button5\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image6\",\"image\":\"x\"}>ET");
          r_flag1 = 0;
          cha_hang2++;
            cha_lie2++;
            cha_zuoxia++;
            cha_youxia++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button5\",\"enable\":false}>ET");
        }
        break;       
  case 54:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image7\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang2++;
            quan_lie3++;
//        quan[1]++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button6\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image7\",\"image\":\"x\"}>ET");
         r_flag1 = 0;
         cha_hang2++;
           cha_lie3++;
           Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button6\",\"enable\":false}>ET");
        }
        break;       
  case 55:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image8\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang3++;
            quan_lie1++;
            quan_zuoxia++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button7\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image8\",\"image\":\"x\"}>ET");
         r_flag1 = 0;
         cha_hang3++;
           cha_lie1++;
            cha_zuoxia++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button7\",\"enable\":false}>ET");
        }
        break;        
  case 56:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image9\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang3++;
            quan_lie2++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button8\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image9\",\"image\":\"x\"}>ET");
         r_flag1 = 0;
         cha_hang3++;
           cha_lie2++;
           Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button8\",\"enable\":false}>ET");
        }
        break;       
  case 57:
        if((r_flag1 == 0)&&(RecievedTemp1[14]==2))
        {
        Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image10\",\"image\":\"circle\"}>ET");
        r_flag1 = 1;
        quan_hang3++;
            quan_lie3++;
            quan_youxia++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button9\",\"enable\":false}>ET");
        }
        else if((r_flag1 == 1)&&(RecievedTemp1[14]==2))
        {
          Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image10\",\"image\":\"x\"}>ET");
         r_flag1 = 0;
         quan_hang3++;
           quan_lie3++;
            quan_youxia++;
            Serial.println("ST<{\"cmd_code\":\"set_enable\",\"type\":\"widget\",\"widget\":\"button9\",\"enable\":false}>ET");
        }
        break;
  }
  if((quan_hang1==3)||(cha_hang1==3))
      {
            Serial.println("ST<{\"cmd_code\":\"set_visible\",\"type\":\"widget\",\"widget\":\"gif4\",\"visible\":true}>ET");
      }
      else if((quan_hang2==3)||(cha_hang2==3))
      {
            Serial.println("ST<{\"cmd_code\":\"set_visible\",\"type\":\"widget\",\"widget\":\"gif5\",\"visible\":true}>ET");
      }
      else if((quan_hang3==3)||(cha_hang3==3))
      {
            Serial.println("ST<{\"cmd_code\":\"set_visible\",\"type\":\"widget\",\"widget\":\"gif6\",\"visible\":true}>ET");
      }
      else if((quan_lie1==3)||(cha_lie1==3))
      {
            Serial.println("ST<{\"cmd_code\":\"set_visible\",\"type\":\"widget\",\"widget\":\"gif7\",\"visible\":true}>ET");
      }
      else if((quan_lie2==3)||(cha_lie2==3))
      {
            Serial.println("ST<{\"cmd_code\":\"set_visible\",\"type\":\"widget\",\"widget\":\"gif8\",\"visible\":true}>ET");
      }
      else if((quan_lie3==3)||(cha_lie3==3))
      {
            Serial.println("ST<{\"cmd_code\":\"set_visible\",\"type\":\"widget\",\"widget\":\"gif9\",\"visible\":true}>ET");
      }
      else if((quan_zuoxia==3)||(cha_zuoxia==3))
      {
            Serial.println("ST<{\"cmd_code\":\"set_visible\",\"type\":\"widget\",\"widget\":\"gif10\",\"visible\":true}>ET");
      }
      else if((quan_youxia==3)||(cha_youxia==3))
      {
            Serial.println("ST<{\"cmd_code\":\"set_visible\",\"type\":\"widget\",\"widget\":\"gif11\",\"visible\":true}>ET");
      }
  }
}
4

The above is the code, is there any way to fix it without replacing the board?

5

All those strings are using up the bulk of the memory. A quick fix is to wrap all those strings being passed to Serial.println() inside F(). e.g, change

Serial.println("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image2\",\"image\":\"circle\"}>ET");

to

Serial.println(F("ST<{\"cmd_code\":\"set_image\",\"type\":\"image\",\"widget\":\"image2\",\"image\":\"circle\"}>ET"));

That will cause the strings to be stored in flash memory (i.e program storage space). When I do that for all your Serial.println() statements, I end up with

Sketch uses 7180 bytes (22%) of program storage space. Maximum is 32256 bytes.
Global variables use 252 bytes (12%) of dynamic memory, leaving 1796 bytes for local variables. Maximum is 2048 bytes.
6

This worked! Thank you so much!

The reason I have such a long string is because the LCD I’m using has its own instruction set.